Malicious PDF — malware analysis report

Static analysis result for SHA-256 381b77ffc6f18966…

MALICIOUS

PDF

76.4 KB Created: 2021-02-08 11:12:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 2671140a0d7b659e991140719a4fee56 SHA-1: 35670b27ad7f501fe30afd7d1338f51db38bfcef SHA-256: 381b77ffc6f18966914f4e9f32688648d76e677c007b6a65af5c3f7f9d9b7e52
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many pointing to domains associated with link farms and SEO spam, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://jottigo.ru/aws?utm_term=urinary+system+parts+and+functions+worksheet PDF link annotation
    • https://cdn.sqhk.co/gawagunikuw/j71diat/force_unmount_external_hard_drive_mac_terminal.pdfIn PDF document text
    • https://cdn.sqhk.co/kapapomabu/gcPaqid/popexagorabikivafabupoli.pdfIn PDF document text
    • https://sakojokotinij.weebly.com/uploads/1/3/1/3/131379540/gexoburajijog.pdfIn PDF document text
    • https://cdn.sqhk.co/wusezofetib/aggKcjb/waukee_ice_cream_shoppe_menu.pdfIn PDF document text
    • http://rirenanevigi.22web.org/56799167742.pdfIn PDF document text
    • https://levapexufusetij.weebly.com/uploads/1/3/4/9/134904519/gikor_zipivafilo_piziwed.pdfIn PDF document text
    • https://cdn.sqhk.co/zogobadakedu/f0iiihO/91703432239.pdfIn PDF document text
    • https://cdn.sqhk.co/tuxonewebuke/cgerlii/tesibajuzinesitugag.pdfIn PDF document text
    • https://fatomokoke.weebly.com/uploads/1/3/4/0/134098041/ee10b.pdfIn PDF document text
    • https://guxesawaxogego.weebly.com/uploads/1/3/4/3/134314991/4675448.pdfIn PDF document text
    • https://cdn.sqhk.co/zujumatatub/oTSQQgh/commercial_pilot_jobs_arizona.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dusubonifu/50523849396.pdfIn PDF document text
    • https://s3.amazonaws.com/savukojubusum/sales_inquiry_report_format.pdfIn PDF document text
    • http://kavimefejemud.rf.gd/31829252846.pdfIn PDF document text
    • https://s3.amazonaws.com/gewisetug/pentax_large_format_digital_camera.pdfIn PDF document text
    • https://s3.amazonaws.com/xisefowu/ae_watan_aabad_rahe_tu_status.pdfIn PDF document text
    • https://s3.amazonaws.com/muvarelo/android_10_update_for_redmi_note_7.pdfIn PDF document text
    • https://s3.amazonaws.com/vexeliku/90461437826.pdfIn PDF document text
    • https://s3.amazonaws.com/nunakixuma/green_lantern_first_flight_movie_480p.pdfIn PDF document text
    • http://fodiwivovekuvut.epizy.com/que_estudia_la_genetica.pdfIn PDF document text
    • https://s3.amazonaws.com/wefemabeni/11991790557.pdfIn PDF document text
    • https://s3.amazonaws.com/ladiwuzetawedi/bofiwuxapekefizojilagoded.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF6 5612 bytes
SHA-256: abb7fc32fa7deedba423c13408d9438ea1dd8b8b6a985b4549a19a665271b48b
font_01_sfnt_off00010000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10000 10500 bytes
SHA-256: 5f8a58aaaaae6a97205a88f689868d2f59e9ee84fa5fc58f0fd7a46e626d43bb

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